| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 |
0.5%
|
| -7 | Does not apply (spontaneous) | 16 |
3.8%
|
| 1 | Yes | 228 |
53.5%
|
| 2 | No | 180 |
42.3%
|
| Sysmiss | 3 |